Put-Call Ratio (Volume) (30-Day)

Put-Call Ratio (Volume): The ratio of puts traded to calls traded, for options with the relevant expiration date.

Prothena Corporation plc (PRTA) had 30-Day Put-Call Ratio (Volume) of 0.0008 for 2026-07-20.

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Figures for 2026-07-20

Volatility Metrics
Historical Volatility (Close-to-Close)	0.4720
Historical Volatility (Parkinson)	0.5021
Implied Volatility (Calls)	0.6840
Implied Volatility (Puts)	0.7445
Implied Volatility (Mean)	0.7143
Put-Call Implied Volatility Ratio	1.0884
Implied Volatility Skew	0.3171
Option Statistics
Put-Call Ratio (Volume)	0.0008
Put-Call Ratio (Open Interest)	0.0011